Amazon has global shipping that many folks use here because the selection is much better online. You can also use the free shipping of Bookdepository.com

Many locals use Taobao.com though, which is probably bigger than Amazon. Sort of a mix of Ebay and Amazon with tons of stuff--but it's in Chinese. I've navigated it successfully using Google Chrome's translate functions.

They charge RRP for everything with a loyalty based discounting scheme. Delivery is slow though, about 5 weeks on average IME. They probably just order it from their overseas suppliers, ship it over by boat and repackage for local re-posting.

But its free shipping in HK for medium sized orders, vs shipping charges on Amazon and elsewhere.

I'll resurface this thread once more: have any other sites popped up since we last discussed this (April '13)?

I just ordered something yesterday and had it shipped to Borderlinx in the US (as per this article, though I haven't received it yet so I can't say how fast the shipping to HK is. The whole process so far has been easy, but I'm curious to hear if any better alternatives have come up in the past 3.5 years.

If you're actually in HK and can read Chinese, then Yahoo Auctions HK is an option. Usually you arrange to pick the stuff up at an MTR station and pay cash. Most things seem to be sold on a buy-now basis. Unlike Taobao, you're dealing with someone locally and don't have to worry about surprising extra charges on the "free" shipping.

As for used books, postage rate increases have made buying from the U.S. pretty expensive these days. U.K. international postage still seems reasonable and there are a lot of second-hand dealers in Britain with rock-bottom prices on common books. Plus, you get the benefit of the recent fall of the pound. On Abebooks you can limit your search to the U.K.